Explain the pressure flow hypothesis of translocation of sugars in plants.

(N/A) According to the pressure flow hypothesis,food is prepared in the plant leaves in the form of glucose.
Before moving into the source cells present in the phloem,the prepared food is converted into sucrose.
Water moves from the xylem vessels into the adjacent phloem via osmosis,thereby increasing the hydrostatic pressure in the phloem at the source.
Consequently,the sucrose moves through the sieve tube elements of the phloem towards the sink.
The sucrose already present in the sink region is converted into starch or cellulose,which reduces the osmotic pressure and the hydrostatic pressure in the sink cells.
Hence,the pressure gradient created between the source and the sink cells allows sugars to be translocated from the source to the sink.
Finally,the sugars are removed from the sink cells through active transport.